package cn.itcast.bookmanager.demo1;

import javax.swing.*;

public class demo1 {
    public static void main(String[] args) {
        JFrame frame = new JFrame("");
        frame.setBounds((1366-400)/2,(768-300)/2,400,300);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(3);
    }
}
